@SalviaSage, while avoiding drifting from your core framework is generally a legitimate request it would make a stronger case if you could list bug fixes or new features that Notepad++ and its users could enjoy.

The current scintilla in Notepad++ is v3.5.6, released 26 May 2015. The current Scintilla release is v4.1.4. That means 27 releases.

The changelog on https://www.scintilla.org/ScintillaHistory.html contains around 500 lines of changes that were made since that version, including over 80 related to various lexers, including (but not limited to) C++, HTML, Python, Ruby, Lua, PowerShell, Perl, SQL, YAML and Markdown. Just the fixes and improvements to those lexers are worth the effort.

And…the longer you wait before updating the “core”, the more difficult and daunting that task becomes. If Scintilla is ever updated, I don’t see it making a one-step jump to a relatively current version.